What was found
HYD 3 LO PRESS INBD GRND SPOILERS FOLLOWED BY TRIPLE CHIME GEAR DISAGREE. DUE TO PREVIOUS MEL 3B WAS ON, ALL MESSAGES CLEARED WITHIN A FEW MINUTES AS WE BEGAN TO RUN QRH. (FLIGHT 3684 - FILED CLOSED) THIS DISCREPANCY WAS TRANSFERRED TO CAMP ITEM . PERFORMED OPS CHECK OF SPOILER CONTROL SYSTEM IN REFERENCE TO CRJ900 AMM 27-61-00 OPS CHECK GOOD, SEE CP# 29445846 FOR REPLACEMENT OF HYD SYSTEM #3 ACCUMULATOR. PERFORMED MULTIPLE LANDING GEAR EXTENSION AND RETRACTIONS IN REFERENCE TO CRJ900 AMM 32-30-00 WITH BOTH 3A AND 3B ON THEN WITH SINGLE PUMP 3A THEN 3B OPS CHECK GOOD.